Big question

So I've been having sex for a few years with a few different partners, men and women alike. I've never bled. Last night I was with a guy and, while I didn't bleed when he actually fucked me, I bled a ton when he fingered me on the next round and it stopped after five-ish minutes. When I gave myself a once-over today, I didn't notice any gashes or anything that seemed like a wound. Can hymens break spontaneously? Also how to I get him to stop freaking out and believe that I'm actually okay?